Uses 7-zip CLI to compress files individually using BZIP2 on Windows

7zip-bzip2.ps1

$path = "C:\Users\mike-\Downloads\stuff"
$7zipPath = "C:\Program Files\7-Zip\7z.exe"

$files = dir $path -Recurse -Include $mask | where {
    ($_.Length / 1KB) -gt 100
}

ForEach ($file in $files) 
{
    Write-Host "$($file.FullName).bz2"
    & $7zipPath a -tbzip2 "$($file.FullName).bz2" $file.FullName
}